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Note 7 - Stockholders' Equity (Details Textual) - $ / shares | 9 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2025 | Jun. 30, 2024 | Dec. 21, 2022
Preferred Stock, Shares Issued (in shares) | 280,898 | 280,898 |
Conversion of Stock, Shares Issued and Outstanding if Converted (in shares) | 9,364 |  |
Common Stock, Shares, Issued (in shares) | 1,704,269 | 1,712,045 |
Common Stock, Shares, Outstanding (in shares) | 1,693,953 | 1,701,729 |
Treasury Stock, Common, Shares (in shares) | 10,316 | 10,316 |
Stock Issued During Period, Shares, New Issues (in shares) | 0 |  |
Preferred Stock, Par or Stated Value Per Share (in dollars per share) | $ 0.001 | $ 0.001 |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ 69.04 | $ 72.1 |
Rights Plan [Member] |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) |  |  | 1
Preferred Stock, Par or Stated Value Per Share (in dollars per share) |  |  | $ 0.001
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) |  |  | $ 58
Series D Preferred Stock [Member] |  |  |
Preferred Stock, Shares Issued (in shares) | 280,898 |  |

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